<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.left{
				float: left;
				width: 200px;
				height: 150px;
				background-color: black;
			}
			.right{
				float: right;
				width: 200px;
				height: 150px;
				background-color: black;
			}
			.middle {
				height: 150px;
				background-color: orange;
			}
			.container::after{
				content: " ";
				display: block;
				clear: both;
			}
			.bottom{
				height: 50px;
				background-color: gray;
			}
		</style>
	</head>
	<body>
		<div class="container">
		        <div class="left"></div>
		        <div class="right"></div>
		        <div class="middle"></div>
		</div>
		<div class="bottom"></div>
	</body>
</html>